A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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The p wave is the pressure or primary wave. The first motion felt is the p-wave, and the direction of its shake points back to the epicenter. its movement is a push outwards, away from the epicenter, kind of like the pressure blast from a large bomb.